Brief Summary: Drugs used in chemotherapy use different ways to stop cancer cells from dividing so they stop growing or die. Colony-stimulating factors such as sargramostim may increase the number of immune cells found in bone marrow or peripheral blood and may help a person's immune system recover from the side effects of chemotherapy. Phase I trial to study the effectiveness of bryostatin 1 combined with sargramostim in treating patients who have refractory myeloid cancer

Detailed Description: PRIMARY OBJECTIVES: I. To determine the maximally tolerated dose of continuous intravenous infusion bryostatin-1 when given in combination with GM-CSF. II. To describe and quantify the frequency of toxicity of the combination of continuous intravenous infusion bryostatin-1 and subcutaneously administered GM-CSF. SECONDARY OBJECTIVES: I. To describe the impact of the combination of bryostatin-1 and GM-CSF on the differentiation and cell cycle distribution of myeloid cells in vivo. II. To describe the impact of the combination of bryostatin-1 and GM-CSF on T lymphocyte populations. III. To assess the pharmacokinetics of continuous infusion bryostatin-1. OUTLINE: This is a dose-escalation study of bryostatin 1. Patients receive bryostatin 1 IV continuously and sargramostim (GM-CSF) subcutaneously once daily on days 1-21. Treatment repeats every 28 days for 4 courses in the absence of disease progression or unacceptable toxicity. Patients with disease stabilization or improvement may continue treatment for up to 12 courses. Cohorts of 2 patients receive escalating doses of bryostatin 1 until the maximum tolerated dose (MTD) is determined. The MTD is defined as the dose at which 30% of patients experience dose-limiting toxicity. PROJECTED ACCRUAL: A maximum of 45 patients will be accrued for this study within 12-18 months.